Logical level converter and phase locked loop using the same

Details Logical level converter and phase locked loop using the same Logical level converter and phase locked loop using the same

2006-04-14

2008-11-04

Pascal, Robert J. (Department: 2817)

Oscillators

Automatic frequency stabilization using a phase or frequency...

Afc with logic elements

C331S074000

Reexamination Certificate

active

07446614

ABSTRACT:
A logical level converter generates an output signal by which a succeeding logical circuit accurately operates even if there is a threshold fluctuation factor. In the logical level converter, an output signal of a voltage control oscillator in a phase locked loop is inputted to a threshold variable inverter. A DC component of another output signal from the threshold variable inverter is inputted to a comparator, and compared with a comparison voltage. A threshold setting signal is outputted on the basis of a comparison result. The threshold value of the threshold variable inverter is changed according to the threshold variable signal, and the output signal is converted into the other output signal. When the comparison result comes to a given state, the value of the threshold setting signal is held, and the other output signal is outputted as a further different output signal.

REFERENCES:
patent: 5210712 (1993-05-01), Saito
patent: 6215364 (2001-04-01), Hwang et al.
patent: 05-007135 (1993-01-01), None
patent: 11-298302 (1999-10-01), None
patent: 2001-358565 (2001-12-01), None

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